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Preparation method of active cathode material, cathode plate and lithium ion battery

A cathode active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low energy density

Inactive Publication Date: 2016-11-23
HIGHPOWER TECH HUIZHOU +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a positive electrode sheet for the problem of low energy density of lithium-ion batteries in the prior art

Method used

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  • Preparation method of active cathode material, cathode plate and lithium ion battery
  • Preparation method of active cathode material, cathode plate and lithium ion battery
  • Preparation method of active cathode material, cathode plate and lithium ion battery

Examples

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preparation example Construction

[0019] The preparation method of positive electrode active material provided by the invention comprises the following steps:

[0020] S1. Obtain the molecular formula as K 7 [MnV 13 o 38 ] precursor material, the average particle size of the precursor material is 36 μm or more;

[0021] S2. Dissolving the precursor material in water, adding a water-soluble alcoholic organic solvent under stirring conditions, performing recrystallization, and obtaining the positive electrode active material after filtration; the volume ratio of the water-soluble alcoholic organic solvent to water 1-5:1.

[0022] In the present invention, the molecular formula is K 7 [MnV 13 o 38 ] is a material known in the prior art, for example, this material can be prepared in the following manner:

[0023] Under the condition of stirring and keeping warm, dissolve 18g of KVO 3 In 500ml of hot water at 80°C (the pH of the solution is about 7), add 10ml of 0.5mol / l sulfuric acid and 0.01mol of MnSO 4...

Embodiment 1

[0052] This example is used to illustrate the preparation method of the positive electrode active material, the positive electrode sheet and the lithium ion battery disclosed in the present invention.

[0053] 1. Synthesis of precursor materials

[0054] Under the condition of stirring and keeping warm, dissolve 18g of KVO 3 In 500ml of hot water at 80°C (the pH of the solution is about 7), add 10ml of 0.5mol / l sulfuric acid and 0.01mol of MnSO 4 ·H 2 O, 5.4 g of K 2 S 2 o 8 React, evaporate and concentrate for 5.5 hours at the same time (the volume of the solution is about 150-200ml at this time). Heat the solution to boiling under vigorous stirring, filter and remove the residue. Add 20 ml of 1 mol / l acetic acid-potassium acetate solution to the filtrate, heat to boiling again, let stand, and slowly cool to room temperature. When red-orange crystals precipitated, filter, wash with 0.5 mol / l acetic acid-potassium acetate solution, and dry in the air. Obtain the molecu...

Embodiment 2

[0064] This example is used to illustrate the preparation method of the positive electrode active material, the positive electrode sheet and the lithium ion battery disclosed in the present invention.

[0065] 1. Preparation of positive electrode active material

[0066] At room temperature, dissolve 0.5 g of the precursor material synthesized in Example 1 in 30 ml of distilled water, stir to dissolve, add 90 ml of ethanol under stirring conditions, and after the product is precipitated, filter to obtain a positive electrode active material with an average particle size of 390 nm .

[0067] 2. Preparation of positive electrode sheet

[0068] The dried positive electrode active material and carbon nanotube (CNT) (containing 95wt% NMP) were mechanically ball milled at a mass ratio of 8.5:1, ball milling speed: 400rpm, ball milling time: 2h, number of rotors: zirconia with a diameter of 10mm 6 balls, 32 zirconia balls with a diameter of 5 mm.

[0069] The positive electrode ac...

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Abstract

The invention provides a preparation method of an active cathode material in order to solve the problem that in the prior art, a cathode of a lithium ion battery is low in energy density. The preparation method is characterized by comprising the following steps that 1, a precursor material of which the molecular formula is K7[MnV13O38] is acquired, wherein the average particle size of the precursor material is 36 micrometers or above; 2, the precursor material is dissolved into water, a water-soluble organic alcohol solvent is added under the stirring condition, recrystallization is conducted, filtration is conducted, and then the active cathode material is obtained, wherein the volume ratio of the water-soluble organic alcohol solvent to the water is (1-5):1. The invention further discloses a cathode plate containing the active cathode material prepared through the method and a lithium ion battery. The active cathode material prepared through the method is small in average particle size, high in effective gram volume and beneficial for increasing the energy density of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion secondary batteries, in particular to a preparation method of a positive electrode active material, a positive electrode sheet and a lithium-ion battery. Background technique [0002] In today's daily life, lithium-ion secondary batteries have been widely used in mobile phones, notebook computers and other digital products, and are indispensable energy storage devices. At present, the cathode materials used in lithium-ion batteries mainly use lithium-ion intercalation transition metal layered oxides, such as LiCoO 2 , LiMn 2 o 4 wait. The charge-discharge process of this type of material depends on the orderly insertion and deintercalation of lithium ions in its lattice structure, and the capacity and cycle stability of these materials are mainly determined by the stability of their crystal structure. During the charging and discharging process, once the crystal structure is damaged or loses its rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/131H01M10/0525
CPCY02E60/10
Inventor 倪尔福程君李文良
Owner HIGHPOWER TECH HUIZHOU
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